Journal of the Korean Magnetics Society (한국자기학회지)

The Korean Magnetics Society (한국자기학회)
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Anisotropy Angle Dependence of Interlayer Exchange Coupling of Perpendicular Magnetic [CoFe/Pt/CoFe]/IrMn Multilayers

[CoFe/Pt/CoFe]/IrMn 다층박막의 수직자기 이방성 각도에 따른 상호교환결합력 특성

  • Lee, Sang-Suk (Dept. of Oriental Biomedical Engineering, Sangji University) ;
  • Choi, Jong-Gu (Oriental Medicine Institute, Sangji University) ;
  • Hwang, Do-Guwn (Dept. of Applied Physics and Electronics, Sangji University) ;
  • Rhee, Jang-Roh (Department of Physics, Sookmyung Women' University)
  • 이상석 (상지대학교 한방의료공학과) ;
  • 최종구 (상지대학교 한방의학연구소) ;
  • 황도근 (상지대학교 응용물리전자학과) ;
  • 이장로 (숙명여자대학교 물리학과)
  • Published : 2008.12.31
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Abstract

Dependence of interlayer exchange coupling on antiferromagnetic IrMn thickness, thermal stability, and parallel anisotropy angle in perpendicular anisotropy [CoFe/Pt/CoFe]/IrMn multilayers was investigated. The magnetic property of [CoFe($10{\AA}$)/Pt($8{\AA}$)/CoFe($10{\AA}$)] induced by antiferromagnetic ordering of IrMn layer was maintained a stable perpendicular anisotropy up to $250^{\circ}C$ and from $7{\AA}$ to $160{\AA}$ of IrMn thickness. The value of interlayer exchange coupling of [CoFe/Pt/CoFe]/IrMn multilayers with perpendicular anisotropy increased to 1.5 times at anisotropy angle of $60^{\circ}$ more than of $0^{\circ}$. On the other side, the interlayer exchange coupling at anisotropy angle of $90^{\circ}$ was $\infty$ Oe, it was likely diverted to a parallel shape magnetization.

[CoFe/Pt/CoFe]/IrMn 다층박막에 대하여 반강자성체 IrMn층 두께 의존성 및 열적안정성, 수평으로 전환하는 각도에 의존하는 수직자기 이방성 특성을 관찰하였다. IrMn층을 통해 유도된 강자성체/비자성체/강자성체 구조인 [CoFe($10{\AA}$)/Pt($8{\AA}$)/CoFe($10{\AA}$)]/IrMn 다층박막은 IrMn 두께 $7{\AA}$부터 상호교환결합력이 형성되었고, 열처리 온도 $250^{\circ}C$까지 열적안정성을 유지하였다. 수직자기 이방성 [CoFe/Pt/CoFe]/IrMn 다층박막에서 바닥 CoFe층과 Pt층을 사이에 두고 반강자성체인 IrMn층에 의해 고정되어 있는 상부 CoFe층간의 상호교환결합력은 이방성 측정 각도가 $0^{\circ}$, $60^{\circ}$일 때 각각 1,000 Oe, 1,500 Oe로, $90^{\circ}$일 때 $\infty$ Oe로 나타났다.

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References

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